commit 875458b778e8d389e00f42269e716a3cb2761fab
author Matt Turner <mattst88@gmail.com> Fri Jul 31 12:18:37 2015 -0700
committer Matt Turner <mattst88@gmail.com> Mon Aug 03 09:24:23 2015 -0700
tree 5db224fb6dfd5d9be69f48ec8ee9581b5c2e110b
parent 44e90f2a556a9b8ede12ae18a7cfa3a71e32d40c

mesa: Add -fno-math-errno to CFLAGS.

Cuts about 9k of .text size.

   text    data     bss     dec     hex filename
4992804  197808   26328 5216940  4f9aac i965_dri.so before
4983676  197808   26328 5207812  4f7704 i965_dri.so after

Also, Darwin's libm does not ever set errno, so if we care about those
systems we shouldn't rely on errno anyway.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

configure.ac

diff --git a/configure.ac b/configure.ac
index 248f618..dc9272d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -286,6 +286,9 @@
     # Work around aliasing bugs - developers should comment this out
     CFLAGS="$CFLAGS -fno-strict-aliasing"
 
+    # We don't want floating-point math functions to set errno
+    CFLAGS="$CFLAGS -fno-math-errno"
+
     # gcc's builtin memcmp is slower than glibc's
     # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
     CFLAGS="$CFLAGS -fno-builtin-memcmp"